Screw anchor and method for producing a screw anchor

Abstract

A screw anchor for insertion into concrete is disclosed. The screw anchor has an essentially cylindrical base body on whose outer lateral surface an external thread is provided and which has a receptacle arranged in the direction of the cylinder longitudinal axis originating from an axial end face. The receptacle has a load-bearing structure originating from the axial end face. A tool receptacle extending essentially in the direction of the cylinder longitudinal axis is provided in the receptacle, wherein the tool receptacle extends further into the receptacle than the load-bearing structure from the end face to the rotary drive of the screw anchor in the cylinder longitudinal direction.

Description

[0001]This application claims the priority of German Patent Document No. DE 10 2011 002 637.1, filed Jan. 13, 2011, the disclosure of which is expressly incorporated by reference herein.BACKGROUND AND SUMMARY OF THE INVENTION[0002]The invention relates to a screw anchor for insertion into concrete having an essentially cylindrical base body on whose outer lateral surface an external thread is provided and which has a receptacle for a fastening means arranged in the direction of the cylinder longitudinal axis originating from an axial end face, the receptacle having a load-bearing structure for the fastening means originating from the axial end face.[0003]The invention also relates to a method for producing such a screw anchor.[0004]To fasten components in a concrete substrate, screw anchors that are screwed into the concrete substrate are frequently used. The advantage of these screw anchors over expansion plugs or expansion impact anchors is that this type of screw anchor is also a...

AI Technical Summary

Benefits of technology

[0009]The tool receptacle is thus configured to be long enough that the torque, which is applied via the tool to the screw anchor or to the receptacle of the screw anchor, is not transmitted completely in the area of the load-bearing structure, but at least partially outside of this area. Furthermore, due to the length of the tool receptacle, the torque is transmitted over a larger area so that strong punctual loads, which could lead to a deformation or damage of the load-bearing structure, may be reduced considerably.

[0010]The tool receptacle preferably extends over the entire axial length of the receptacle so that the load may be transmitted to the screw anchor over an area that is as large as possible. The advantage of this is that a torsion load of the screw anchor may be reduced. If the tool were to engage on the screw anchor only over a short length on the axial end face, this would produce a torsion load between a first end of the screw anchor, on which the tool engages, and the opposite second end of the screw anchor, with which the screw anchor is already inserted into the concrete borehole, at the beginning of the screw-on process due to the high screw-in forces. Because of the long tool receptacle, the load contact point is effectively distributed over the entire length of the receptacle, and also appro

Problems solved by technology

The disadvantage of this, however, is that the load-bearing structure of the receptacle may be damaged by the tool with the high screw-in forces that are required when screwing into a con

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